i2c: fix stack buffer overflow vulnerability in i2c md command

When running "i2c md 0 0 80000100", the function do_i2c_md parses the
length into an unsigned int variable named length. The value is then
moved to a signed variable:

    int nbytes = length;
    #define DISP_LINE_LEN 16
    int linebytes = (nbytes > DISP_LINE_LEN) ? DISP_LINE_LEN : nbytes;
    ret = dm_i2c_read(dev, addr, linebuf, linebytes);

On systems where integers are 32 bits wide, 0x80000100 is a negative
value to "nbytes > DISP_LINE_LEN" is false and linebytes gets assigned
0x80000100 instead of 16.

The consequence is that the function which reads from the i2c device
(dm_i2c_read or i2c_read) is called with a 16-byte stack buffer to fill
but with a size parameter which is too large. In some cases, this could
trigger a crash. But with some i2c drivers, such as drivers/i2c/nx_i2c.c
(used with "nexell,s5pxx18-i2c" bus), the size is actually truncated to
a 16-bit integer. This is because function i2c_transfer expects an
unsigned short length. In such a case, an attacker who can control the
response of an i2c device can overwrite the return address of a function
and execute arbitrary code through Return-Oriented Programming.

Fix this issue by using unsigned integers types in do_i2c_md. While at
it, make also alen unsigned, as signed sizes can cause vulnerabilities
when people forgot to check that they can be negative.

Signed-off-by: Nicolas Iooss <nicolas.iooss+uboot@ledger.fr>
Reviewed-by: Heiko Schocher <hs@denx.de>

diff --git a/cmd/i2c.c b/cmd/i2c.c
index 9050b2b..bd04b14 100644 (file)
--- a/cmd/i2c.c
+++ b/cmd/i2c.c
@@ -200,10 +200,10 @@ void i2c_init_board(void)
  *
  * Returns the address length.
  */
-static uint get_alen(char *arg, int default_len)
+static uint get_alen(char *arg, uint default_len)
 {
-       int     j;
-       int     alen;
+       uint    j;
+       uint    alen;
 
        alen = default_len;
        for (j = 0; j < 8; j++) {
@@ -247,7 +247,7 @@ static int do_i2c_read(struct cmd_tbl *cmdtp, int flag, int argc,
 {
        uint    chip;
        uint    devaddr, length;
-       int alen;
+       uint    alen;
        u_char  *memaddr;
        int ret;
 #if CONFIG_IS_ENABLED(DM_I2C)
@@ -301,7 +301,7 @@ static int do_i2c_write(struct cmd_tbl *cmdtp, int flag, int argc,
 {
        uint    chip;
        uint    devaddr, length;
-       int alen;
+       uint    alen;
        u_char  *memaddr;
        int ret;
 #if CONFIG_IS_ENABLED(DM_I2C)
@@ -469,8 +469,8 @@ static int do_i2c_md(struct cmd_tbl *cmdtp, int flag, int argc,
 {
        uint    chip;
        uint    addr, length;
-       int alen;
-       int     j, nbytes, linebytes;
+       uint    alen;
+       uint    j, nbytes, linebytes;
        int ret;
 #if CONFIG_IS_ENABLED(DM_I2C)
        struct udevice *dev;
@@ -589,9 +589,9 @@ static int do_i2c_mw(struct cmd_tbl *cmdtp, int flag, int argc,
 {
        uint    chip;
        ulong   addr;
-       int     alen;
+       uint    alen;
        uchar   byte;
-       int     count;
+       uint    count;
        int ret;
 #if CONFIG_IS_ENABLED(DM_I2C)
        struct udevice *dev;
@@ -676,8 +676,8 @@ static int do_i2c_crc(struct cmd_tbl *cmdtp, int flag, int argc,
 {
        uint    chip;
        ulong   addr;
-       int     alen;
-       int     count;
+       uint    alen;
+       uint    count;
        uchar   byte;
        ulong   crc;
        ulong   err;
@@ -985,7 +985,7 @@ static int do_i2c_loop(struct cmd_tbl *cmdtp, int flag, int argc,
                       char *const argv[])
 {
        uint    chip;
-       int alen;
+       uint    alen;
        uint    addr;
        uint    length;
        u_char  bytes[16];